How to use 'quality' and 'weight' under 'smooth stroke' in say dodge/burn tool

How to use 'quality' and 'weight' under 'smooth stroke' in say dodge/burn tool

Could anyone explain to me the use of 'quality' and 'weight' under 'smooth stroke' in say dodge/burn tool. This option is available under some other tools too but I am not able to find the effect of these options even after scouring the net and could not find any difference after changing the default values.

Version GIMP 2.8.X from software centre of Ubuntu 13.04; no modifications, no extras.

RE: How to use 'quality' and 'weight' under 'smooth stroke' in say dodge/burn tool

(Dec 11, 2013 08:10)ofnuts Wrote: These are used to avoid jitter when you draw lines by hand.

Left: without, right: with

The following passage is from one of official documents for GIMP

"Smooth Stroke:
This option doesn't affect the rendering of the brush stroke but its “shape”. It takes away the wobbles of the line you are drawing. It makes drawing with a mouse easier.

When this option is checked, two setting areas appear, Quality and Weight. You can change the default values to adapt them to your skill"

I am not able to make out whether there is any change in the smoothness, when I change default values of 'Quality' and 'Weight' therefore I made the request for explanation/elaboration of these two terms.